Harmonic signaling device for telephone systems.



W. W. DEAN. HARMONIG SIGNALING DEVICE FOR TELEPHONE SYSTEMS.

APPLICATION FILED SEPT. 9, 1905.

LIQ5AQ5O Patented Jan. 19, 1915.

rib.

V a WILLIAM w. DEAN, OF ELYRIA, OHIO; CURTIS B. CAMP, TRUSTEE, APPOINTED B3! COURT;

.ZHARMONIC SIGNALING DEVICE FOR TELEPHONE SYSTEMS.

Specification of Letters Patent.

Patented Jan. 19, 1915.

Application filed September 9, 1905. Serial-No. 277,653.

Devices for Telephone Systems, of which.

the following is a specification, reference being had therein to the accompanying draw- My invention relates to harmonic signaling systems, and particularly to. the signal receiving devices used therein.

Specifically stated, it comprises a polarized ringer having a spring mounted armature which with its connected parts is sov arranged that the three factors of length, mass and tension may bereadily predetermined to secure absolute tuning 0 each ringer. The armature is carried in a flat. yoke secured upon the pole pieces of the ringer magnet, and is pivoted upon pointed screws or studs, being tensioned thereagainst by means of a parallel spring screwed or riveted at its ends to the yoke, and also screwed or riveted at an intermediate point to the armature. A

My invention is illustrated in the accom panying drawings wherein: 3 I

l' igure 1 is a top plan view of a ringer embodying my improvements; Fig. 2 is a side view of the same; Fig. 3 is a detail'of the armature pivots.

Referring to the drawings, A indicates a pair of electro-magnet spools mounted upon cores (2? carried and magnetically connected by'and through the iron yoke Y. This yoke also carries the permanent magnet M for polarizing the cores and armature, and the adustable gong posts g,-carry1ng the gongs G. A nice and accurate adjustment of the gongs being required, I mount each gong post upon a segment 9 pivoted at one end and having teeth at the other which mesh with the threads of a worm g on a spindle journaled in the drop ears y of the yoke Y.

While all the features I have thus mentioned are of my own design, I do not claim them herein, since they are described and claimed in other co-pending applications. The present invention concerns itself particularly with the armature connections and mounting. The armature itself is shown at A, and carries the clapper-rod a and the capper a which is normally Gpositioned in-. termediate of the two gongs The arma- .threaded directly on the with openings a screws, their points resting upon the upper surface of the steel spring a. The tension ture is pivoted-upon the yoke B- carried by the cores a whereon it is adjustably secured by the nuts (1 The nuts may be cores, or upon the sleeve surrounding the-same. The ends of the yoke 13 are bent down and return at b, and to them are secured by screws or rivets secured by screws or rivets at its middle portion to thearmature A. The tension of this spring determines the tension on the armature and the'degree of stiffness in its movement. Other things being equal, the stiffer the spring the higher the rate of vibration of the connected parts. While the armature is thus in a sense carried by a spring, I have found it necessary to determine accurately the line oraxis upon which it will swing, and this more particularly because of the length of the spring a preferred form of pivot connections is best shown in Figs. 2 and 3, the former being a side view, and the latter a section. The yoke carries a pair of pointed screws 5', which are tapped down through its body on a transverse line midway between its ends and secured when adjusted by means of lock nuts I). The armature is provided to receive the ends of these ofthe spring is such as to force the armature up toward the pole .pieces of the magnet,

and the spring therefore impinges upon the pointsof the screws with considerable force. As the armaturevibrates it turns upon the axis which passes through the points of the two screws, and since this axis lies in the upper plane of the spring itself, I secure a very nice and accurate adjustment for all pur oses.

T e operation of my. invention is sufiiciently apparent from the foregoing description. Ordinary ringing currents have no effect upon the armature, but when current of the proper frequency is thrown upon the line, the c apper-rod will be vibrated, the motion building up very rapidly until a loud andsonorous ringing of the gongs is secured. It Should be particularly observed that the period of vibration of-the clapperrod and its connecting parts is determined, as well as the frequency of the current to which it will respond, independently of any reactive effect due to the strokes on the gongs. I find that with the parts properly The the ends of a stiff spring a which isalso I ortioned, and particularly by giving a" slig . extreme position and the side of the go piece, and the duration of the clapper rod will springat the end each stroke as the armature strikes the pole impact will thus beso short as' to render the gon effect negligible, even ifit were not alrea y so by reason of the strength of operation.

Having thus described my invention what I claim and desire to secure by Letters Patent is:

1. In a harmonic selective ringer, a frame carrying an electro-magnet, a polarizing magnet therefor, a yoke extending across the poles of said magnet and having its ends returned away fromthe same, a prismatic spring secured by its ends across the ends of the yoke, an armature secured within the yoke and across the poles of the magnet, and upon the middle portion of the spring,

- substantially as described.

-2. In a selective ringer for harmonic si naling systems, the combination of the fo lowing instrumentalities: a frame carrying a pair of cores with energizing windings thereon, a pair of gongs adjustably mounted on the frame, an elongated yoke extending across the cores or pole pieces and having projecting, ends bent away from the same, a flat spring extending parallel to said yoke and having its ends secured to the ends thereof, an armature secured upon said 5 ring and lying parallel thereto between t e same and the yoke with its extremities in juxtaposition to the pole pieces, and a pivotal support for said armatures, substantially as deaenbedt r v A 8. In a rin er, an electromagnet, a gong, an armature c apper rod and clapper rigidly associated, a: spring "for" supporting and pivoting such armature in operativerelation to such electromagnet, such spring I adapted to be flexed when sucharmature is acted upon by such electromagnet, and means for maintaining the center of oscillation of such armaturein the same position relatively to such electromagnet during the energization thereofi I 4:; In a ringer, an electromagnet, a air ofgongs, per rigidly associated, a spring for supportin and-pivoting s'uch armature in operative re ation to such electromagnet, such spring adapted to normally'hold such clapper midway between suchgongs and adapted to be flexed when such armature is acted upon by such electromagnet,nreans for maintaining the center of oscillation of such armature in the same position relatively to such electromagnet during the energization thereof, andmeans for subjecting such spring to initial tension during such energization while under conditions of rest such spring is free from tension.

In testimony 'whereof I afiix my signature in presence of two witnesses. I

WILLIAM DEAN.

Witnesses:

RAY H. Manson, S. A. BEYLAND.

'an armature clapper rod and 0 ap- 

